Rotation transmitting device and hydraulic drive device

ABSTRACT

A hydraulic drive device, comprising a hydraulic motor ( 10 ), a rotating body ( 20 ) connected to the drive shaft ( 11 ) of the hydraulic motor( 10 ), functioning, by itself as a flywheel, and having an internal gear ( 21 ) formed on the output side thereof, a rotation transmitting device ( 1 ) having a gear mechanism for transmitting the rotating force of the rotating body ( 20 ) to an output shaft gear ( 50 ) by allowing counter gears ( 30 ) to mesh with the internal gear ( 21 ) and the outer shaft gear ( 50 ) to mesh with the counter gears ( 30 ), and an output shaft connected to the output shaft gear ( 50 ). whereby, since a variation in rotating speed of the hydraulic motor ( 10 ) can be absorbed by the rotation transmitting device ( 1 ), the hydraulic motor( 10 ) can be used directly as the drive source of a vehicle such as a car and a truck.

TECHNICAL FIELD

[0001] The present invention relates to a rotation transmitting devicefor transmitting rotation driving force generated by a hydraulic motoror the like to a driven side and to a hydraulic drive unit utilizing therotation transmitting device.

BACKGROUND ART

[0002] Hitherto, there has been no technique to directly connect a motorsuch as hydraulic motor, pneumatic motor, etc. to a generator and drivethe generator using the motor as a drive source. This is because themotor such as hydraulic motor or pneumatic motor tends to vary orfluctuate in number of rotations and it is not possible to obtain astable rotating speed of the motor. Accordingly, there has been aproblem in directly connecting an output shaft of the motor to thegenerator and using the motor as the drive source of the generator.

[0003] There has been no technique to use a hydraulic motor as a drivesource (engine) of a vehicle such as car or truck, either. Likewise inthe foregoing description, this is because the hydraulic motor is easyto vary or fluctuate in number of rotations and it is not possible toobtain a stable rotating speed of the hydraulic motor. Accordingly,there has been a problem in directly using the hydraulic motor as thedrive source (engine) of the vehicle such as car or truck.

[0004] The present invention was made to solve the above-discussedproblems, and has an object of using a compact rotation transmittingdevice in order to obtain a stable rotation of a motor and directlyutilize the motor as a drive source (engine) of a generator or the likeeven in the case of using the motor such as hydraulic motor, pneumaticmotor, etc. easy to vary in number of rotations.

[0005] Another object of the invention is to absorb the variation innumber of rotations of the hydraulic motor with the use of the rotationtransmitting device and directly utilize the hydraulic motor as a drivesource of the vehicle such as car or truck.

DISCLOSURE OF INVENTION

[0006] A rotation transmitting device according to the present inventionis characterized by including: a rotating body that is connected to aninput shaft driven by a motor and functions by itself as a flywheel, andon the output side of which an internal gear is formed; and a gearmechanism for transmitting rotating force of the mentioned rotating bodyto an output shaft formed on an output shaft gear by allowing countergears to mesh with the mentioned internal gear and the output shaft gearto mesh with these counter gears. Since the rotating body itselffunctions as a flywheel, even if a motor such as hydraulic motor orpneumatic motor easy to vary in number of rotations is connected to theinput side, the variation in rotation of this motor can be absorbed,whereby a stable rotating speed can be obtained (rotating speedstabilizing function). Further, since the internal gear is formed on theoutput side of the rotating body and the counter gears are allowed tomesh with this internal gear, and the output shaft gear is allowed tomesh with these counter gears, it is possible to freely change rotatingspeed ratio by changing number of the counter gears or diameter of thecounter gears and that of the output shaft gear (rotating speed changefunction). Furthermore, since the mentioned rotating speed stabilizationfunction and the rotating speed change function can be incorporated inthe rotating body, the entire device can be made considerably compact.

[0007] Another rotation transmitting device according to the inventionis characterized by including: a rotating body that is connected to aninput shaft driven by a motor and functions by itself as a flywheel, andon the output side of which an internal gear is formed; and a gearmechanism for transmitting rotating force of the mentioned rotating bodyto an output shaft formed on an output shaft gear by allowing the outputshaft gear to mesh with the mentioned internal gear. Since the rotatingbody itself functions as a flywheel, even if a motor such as a hydraulicmotor or a pneumatic motor easy to vary in number of rotations isconnected to the input side, the variation in rotation of the motor canbe absorbed, whereby a stable rotating speed can be obtained (rotatingspeed stabilization function). Further, since the internal gear isformed on the output side of the rotating body and the output shaft gearis allowed to mesh with this internal gear, it is possible to freelychange rotating speed ratio by changing diameter of the output shaftgear (rotating speed change function). Furthermore, since the rotatingspeed stabilization function and the rotating speed change function canbe incorporated in the rotating body, the entire device can be madeconsiderably compact.

[0008] Further, the invention is characterized by including a mechanismfor regulating axial movement of the mentioned rotating body. As aresult, there is an advantage of preventing the rotating body fromwobbling in axial direction, thus making more stable the rotation of therotating body.

[0009] Further, the invention is characterized by including a brakemechanism that presses a band body provided with rollers or balls on theouter circumference of the mentioned rotating body. As a result, itbecomes possible to accurately put a brake on the rotating body.

[0010] The invention further provides a hydraulic drive unit in which ahydraulic motor is connected to a hydraulic pump driven by a drive shaftof a vehicle and a drive source is operated by rotating force of thishydraulic motor, the hydraulic drive unit being characterized in thatthe mentioned rotation transmitting device is connected to between thementioned hydraulic motor and the mentioned drive source. As a result,it becomes possible to utilize the drive shaft of the vehicle, therebydriving the drive source for generator, power-generating turbine, aircompressor, submersible pump, etc.

[0011] Another hydraulic drive unit according to the invention ischaracterized by including: a hydraulic motor; a rotation transmittingdevice, which has a rotating body that is connected to a drive shaft ofthe mentioned hydraulic motor and functions by itself as a flywheel, andon the output side of which an internal gear is formed, and a gearmechanism for transmitting rotating force of the mentioned rotating bodyto an output shaft formed on an output shaft gear by allowing countergears to mesh with the mentioned internal gear and the output shaft gearto mesh with these counter gears; and an output shaft that is connectedto the mentioned output shaft gear. Since the rotating body itselffunctions as a flywheel, variation in number of rotations of thehydraulic motor can be absorbed and it becomes possible to change to astable rotating speed (rotating speed stabilization function). Further,as a result of forming the internal gear on the output side of therotating body, allowing the counter gears to mesh with the mentionedinternal gear, and allowing the output shaft gear to mesh with thosecounter gears, it becomes possible to freely change rotating speed ratioby changing number of the counter gears or diameter of the counter gearsand that of the output shaft gear (rotating speed change function). Therotating speed stabilization function and the rotating speed changefunction can be incorporated in the rotating body and the entire devicebecomes considerably compact. As a result, it becomes possible toachieve a vehicle drive device using the hydraulic motor as a drivesource.

[0012] A further hydraulic drive unit according to the invention ischaracterized by including: a rotation transmitting device, whichincludes a hydraulic motor, a rotating body that is connected to a driveshaft of the hydraulic motor and functions by itself as a flywheel, andon the output side of which an internal gear is formed, and a gearmechanism for transmitting rotating force of the foregoing rotating bodyto an output shaft gear by allowing the output shaft gear to mesh withthe foregoing internal gear; and an output shaft connected to thementioned output shaft gear. Since the rotating body itself functions asa flywheel, the variation in number of rotations of the hydraulic motoris absorbed and a stable rotating speed is obtained (rotating speedstabilization function). Further, since the internal gear is formed onthe output side of the rotating body and the output shaft gear isallowed to mesh with this internal gear, it is possible to freely changerotating speed ratio by changing diameter of the output shaft gear(rotating speed change function). Furthermore, the rotating speedstabilization function and the rotating speed change function can beincorporated in the rotating body and the entire device can be madeconsiderably compact. As a result, it becomes possible to achieve avehicle drive device using the hydraulic motor as a drive source.

[0013] Further, the invention is characterized by including a mechanismfor regulating axial movement of the foregoing rotating body. As aresult, there is an advantage of preventing the rotating body fromwobbling in axial direction, thus making more stable the rotation of therotating body.

[0014] Further, the invention is characterized by including a brakemechanism that presses a band body provided with rollers or balls on theouter circumference of the mentioned rotating body. As a result, itbecomes possible to accurately regulate movement of the rotating body.

[0015] Further, the mentioned hydraulic drive unit according to theinvention is characterized by including a generator driven by rotationof the mentioned output shaft, a battery charged with power generated bythe mentioned generator, an electric motor driven by the power of thementioned battery, and a hydraulic suction pump that is driven by thementioned electric motor and sucks hydraulic fluid from a hydraulicfluid tank; and in which the hydraulic fluid sucked by the hydraulicsuction pump is introduced into the mentioned hydraulic motor through anactuation switching valve. As a result, it becomes possible to drive avehicle such as truck without fuel such as gasoline.

[0016] Further, the invention is characterized in that plural sets ofthe mentioned generator and battery are disposed, and so long as abattery of any one set is working, a battery of the other set is chargedwith power. As a result, it becomes possible to continue operation bythe hydraulic motor.

[0017] Further, this invention is characterized in that plural sets ofthe mentioned electric motor and hydraulic suction pump are disposed,and so long as any electric motor and hydraulic suction pump of one setare operating, electric motor and hydraulic suction pump of the otherset are caused to stop operation. As a result, it becomes possible tocontinue operation by the hydraulic motor.

BRIEF DESCRIPTION OF DRAWINGS

[0018]FIG. 1 is a sectional side view showing a rotation transmittingdevice according to Embodiment 1 of the present invention.

[0019]FIG. 2 is a schematic view showing a gear mechanism disposed in aninternal gear of a rotating body according to Embodiment 1 of theinvention.

[0020] FIGS. 3 (a) and (b) are schematic views respectively showing abrake mechanism of the rotating body according to Embodiment 1 of theinvention.

[0021]FIG. 4 is a schematic view showing another gear mechanism disposedin an internal gear of a rotating body of this invention.

[0022]FIG. 5 is a schematic view showing a further gear mechanismarranged in an internal gear of a rotating body of this invention.

[0023]FIG. 6 is a schematic view showing a still further gear mechanismarranged in an internal gear of a rotating body of this invention.

[0024]FIG. 7 is a sectional side view showing another rotationtransmitting device of the invention.

[0025]FIG. 8 is a schematic view showing a hydraulic drive unitaccording to Embodiment 2 of the invention.

[0026]FIG. 9 is a sectional side view showing a hydraulic drive unit fora vehicle according to Embodiment 3 of the invention.

[0027]FIG. 10 is a schematic view showing the entire structure of ahydraulic drive unit for a vehicle according to Embodiment 4 of theinvention.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1

[0028]FIG. 1 is a sectional side view showing a rotation transmittingdevice 1 according to Embodiment 1 of this invention. In this rotationtransmitting device 1, rotation driving force of a hydraulic motor 10 istransmitted to a rotating body 20 connected to an input shaft 11. Thisrotating body 20 is composed of steel and manufactured through, forexample, forging or casting, has a predetermined inertial mass W, andperforms by itself a function as a flywheel. A recess 22 is provided onthe output side of the rotating body 20, and an internal gear 21 isformed on a side wall of the recess 22 through cutting. A protrusion 23is formed on the outer circumference of the rotating body 20, and thisprotrusion 23 is regulated by a recess 61 provided on a stationary frame60.

[0029]FIG. 2 is a view showing a gear mechanism disposed in the internalgear of the mentioned rotating body 20, and is a schematic view takenfrom the output side showing counter gears 30 meshing with the internalgear 21 and an output shaft gear 50. Three counter gears 30 are in meshwith the internal gear 21 of the mentioned rotating body 20 as planetgears. The three counter gears 30 are disposed at approximately 120degrees from each other with respect to the center of the rotating body20. Shafts 31 of the counter gears 30 are rotatably mounted on a fixedplate 65 through bearings 32. The fixed plate 65 is fixed to thestationary frame 60 with bolts 67. The output shaft gear 50 meshing withthese counter gears 30 is disposed at the central part among the threecounter gears 30. An output shaft 51 integrally formed with the outputshaft gear 50 is connected to a generator 55.

[0030]FIG. 3 shows a brake mechanism of the mentioned rotating body 20,and in which FIG. 3(a) is a schematic view taken from the output side,and FIG. 3(b) is a sectional view taken along the line X-X. In thedrawings, a band body 70 and steel rollers 71 rotatably mounted on thisband body 70 are disposed on the outer circumference of the rotatingbody 20, thus forming a brake mechanism. A pair of brake mechanisms(each composed of the band body 70 and the rollers 71) is arrangedsymmetrically about the center of the rotating body 20.

[0031] Now, operation of the rotation transmitting device of Embodiment1 is herein after described. Rotation driving force generated in thehydraulic motor 10 is transmitted to the rotating body 20 through theinput shaft 11. The rotating body 20 has a predetermined inertial massW, absorbs and emits rotational energy produced in the hydraulic motor10, eliminates variation in rotation as much as possible, and rotates ata stable engine speed. The protrusion 23 on the outer circumference ofthe rotating body 20 is regulated by the recess 61 on the stationaryframe 60 so that the rotating body 20 is prevented from moving in axialdirection and rotation of the rotating body 20 becomes more stable.

[0032] The rotation of the rotating body 20 (indicated by the arrow A inFIG. 2) is transmitted to the counter gear 30 through the internal gear21 (indicated by the arrow B in FIG. 2). The rotation is furthertransmitted to the output shaft gear 50 through the counter gear 30(indicated by the arrow C in FIG. 2). The rotation of the output shaftgear 50 is transmitted to the generator 55 through the output shaft 51and drives the generator 55.

[0033] As shown in FIG. 3, to brake the rotating body 20, the bandbodies 70 are moved toward the center of the rotating body 20 (directionindicated by the arrow D). Then the rollers 71 provided on the bandbodies 7Q are pressed on an outer circumferential face 24 of therotating body 20, thereby putting a brake on the rotating body 20.

[0034] The foregoing Embodiment 1 shows a mechanism in which the threecounter gears 30 meshing with the internal gear 21 and the output shaftgear 50 are disposed to act as the gear mechanism disposed in theinternal gear 21 of the rotating body 20. The three counter gears 30 arein mesh with the internal gear 21, and the three counter gears 30 are inmesh with the output shaft gear 50.

[0035] However, as shown in FIG. 4, it is also preferable that onecounter gear 30A is in mesh with the internal gear 21 and the outputshaft gear 50, and the rotating force of the rotating body 20 istransmitted to the output shaft 51 through this counter gear 30A. Inthis case, it is preferable to arrange a structure so that supportinggears 30B being in mesh with the internal gear 21 and not with theoutput shaft gear 50 are disposed so as to support the rotating body 20thereby obtaining a stable rotation of the rotating body 20. Inaddition, the counter gear 30A and the supporting gears 30B are bothrotatably mounted on the fixed plate 65 shown in FIG. 1.

[0036] Although FIG. 2 shows a structure in which three counter gears 30meshing with the internal gear 21 are disposed, it is also preferablethat number of the counter gears is one or more.

[0037] Further, the foregoing Embodiment 1 shows a mechanism, in whichthe counter gears 30 meshing with the internal gear 21 and the outputshaft gear 50 meshing with the counter gears 30 are disposed, as a gearmechanism arranged in the internal gear 21 of the rotating body 20.However, in this structure, direction of rotation of the rotating body20 (arrow A) and that of the output shaft gear 50 (arrow C) aredifferent from each other as shown in FIG. 2. To cope with this, FIG. 5shows an arrangement in which a first counter gear 301 is in mesh withthe internal gear 21, a second counter gear 302 is in mesh with thefirst counter gear 301, and the output shaft gear 50 is in mesh with thesecond counter gear 302. According to such arrangement, the rotatingbody 20 and the output shaft 51 rotate in the same direction ofrotation.

[0038] Furthermore, the rotating force of the rotating body 20 istransmitted to the output shaft gear through the counter gears in theforegoing Embodiment 1. It is also preferable that the output shaft gear50 is disposed to directly mesh with the internal gear 21 of therotating body 20 so that the rotating force is directly transmitted fromthe rotating body 20 to the output shaft 51 as shown in FIG. 6.

[0039] Further, the foregoing Embodiment 1 shows a structure in whichthe protrusion 23 is provided on the outer circumference of the rotatingbody 20 to regulate axial movement of the rotating body 20. Thisprotrusion 23 makes a regulation with the recess 61 of the stationaryframe 60 so that the rotating body 20 is prevented from moving in axialdirection. It is also preferable that a recess is provided on the outercircumference of the rotating body 20 and this recess is subject to theregulation with a protrusion of the stationary frame.

[0040] Furthermore, although the foregoing Embodiment 1 shows astructure comprised of the band body 70 and the rollers 71 to act as abrake mechanism, it is also preferable that the brake mechanism iscomprised of a band body and balls rotatably mounted on the band body.

[0041]FIG. 7 is a sectional side view showing one of preferred modes ofthe foregoing rotation transmitting device 1. In FIG. 7, the rotatingbody 20 of the rotation transmitting device 1 is surrounded by housings60 a, 60 b, and 60 c on the stationary side, and the protrusion 23 ofthe rotating body 20 is regulated by the mentioned housings. In thisarrangement, it is possible to increase volume of the protrusion 23, andtherefore an inertial weight W of the rotating body is also increased,making it possible to keep a stable rotating force. Further, in FIG. 7,a separately prepared internal gear 21 is mounted on the recess 22 onthe output side of the rotating body 20 with a bolt or the like. A firstcounter gear 501 to be in mesh with this internal gear 21 and a secondcounter gear 502 to be in mesh with the first counter gear 501 aredisposed. The output shaft gear 50 comes to mesh with the second countergear 502 in this construction. In addition, shafts 501 a and 502 a ofthe first and second counter gears 501 and 502 are fixed to a stationaryframe 60 e, and the first and second counter gears 501 and 502 arerotatably disposed on these shafts 501 a and 502 a.

Embodiment 2

[0042]FIG. 8 is a schematic view showing a hydraulic drive unitaccording to Embodiment 2 of the invention.

[0043] In the drawing, a drive shaft 203 is mounted on a transmission201 of a vehicle. The drive shaft 203 drives a hydraulic suction pump202 so that hydraulic fluid is sucked from a hydraulic fluid tank 204.The sucked hydraulic fluid is introduced into a switching valve 206through a hose 205. The hydraulic fluid switched by the switching valve206 is introduced into an actuation valve 208 through a hose 207, and isfurther introduced from the actuation valve 208 into the hydraulic motor10 through a hose 209. The rotation driving force of the hydraulic motor10 is transmitted to a drive source 300 for generator, power-generatingturbine, air compressor or a submersible pump through the rotationtransmitting device 1 described in the foregoing embodiment.

Embodiment 3

[0044]FIG. 9 is a sectional side view showing a hydraulic drive unit fora vehicle according to Embodiment 3 of the invention. The hydraulicdrive unit for a vehicle according to this embodiment is comprised ofthe hydraulic motor 10, the rotation transmitting device 1 describedabove in the foregoing Embodiment 1, and the output shaft 51. Therotating body 20 of the rotation transmitting device 1 is connected tothe drive shaft 11 of the hydraulic motor 10. This rotating body 20 ispreferably made of steel, has a predetermined inertial mass W, andfunctions by itself as a flywheel. The recess 22 is provided on theoutput side of the rotating body 20,in which the internal gear 21 isformed. The protrusion 23 is provided on the outer circumference of therotating body 20, and this protrusion 23 is regulated by the recess 61provided in the frame 60 on the stationary side.

[0045] In addition, a shaft-fixing metal piece 120 and a shaft-fixingmetal 121 support the drive shaft 11 and the output shaft 51respectively.

[0046]FIG. 2 is a view showing a gear mechanism disposed in the internalgear of the foregoing rotating body 20, and is a schematic view takenfrom the output side showing the counter gears 30 meshing with theinternal gear 21 and the output shaft gear 50. Three counter gears 30are in mesh with the internal gear 21 of the foregoing rotating body 20to act as planet gears. The three counter gears 30 are disposed atapproximately 120 degrees from each other with respect to the center ofthe rotating body 20. The shafts 31 of the counter gears 30 arerotatably mounted on the fixed plate 65 through the bearings 32. Thefixed plate 65 is fixed to the stationary frame 60 with bolts 67.Further, the output shaft gear 50 meshing with these counter gears 30 isdisposed at the central part among the three counter gears 30. Theoutput shaft 51 is connected to the output shaft gear 50.

[0047]FIG. 3 is a view showing a brake mechanism of the foregoingrotating body 20, and FIG. 3(a) is a schematic view taken from theoutput side, and FIG. 3(b) is a sectional view taken along the line X-X.In the drawing, a band body 70 and steel rollers 71 rotatably mounted onthis band body 70 are disposed on the outer circumference of therotating body 20 to act as a brake mechanism. Further, a pair of brakemechanisms (each comprised of the band body 70 and the rollers) isdisposed symmetrically about the center of the rotating body 20.

[0048] Now, operation of the hydraulic drive unit for a vehicle ofEmbodiment 3 is hereinafter described. The rotation driving forceproduced in the hydraulic motor 10 is transmitted to the rotating body20 through the drive shaft 11. The rotating body 20 has a predeterminedinertial mass W, absorbs and emits rotational energy produced in thehydraulic motor 10, eliminates variation in rotation as much aspossible, and rotates at a stable engine speed. The protrusion 23 on theouter circumference of the rotating body 20 is regulated by the recess61 on the stationary frame 60 so that the rotating body 20 is preventedfrom moving in axial direction and the rotation of the rotating body 20becomes more stable.

[0049] The rotation of the rotating body 20 (indicated by the arrow A inFIG. 2) is transmitted to the counter gear 30 through the internal gear21 (indicated by the arrow B in FIG. 2). The rotation is furthertransmitted to the output shaft gear 50 through this counter gear 30(indicated by the arrow C in FIG. 2). The rotation of the output shaftgear 50 is taken out through the output shaft 51 to act as a drivesource of the vehicle.

[0050] As shown in FIG. 3, to brake the rotating body 20, the bandbodies 70 are moved toward the center of the rotating body 20 (directionindicated by the arrow D). Then the rollers 71 provided on the bandbodies 70 are pressed on the outer circumferential face 24 of therotating body 20, thereby putting a brake on the rotating body 20.

[0051] Constitution and operation of the rest of the rotationtransmitting device 1 are the same as those explained in the foregoingEmbodiment 1, and further explanation thereof are omitted herein.

Embodiment 4.

[0052]FIG. 10 is a schematic view showing the whole of a hydraulic driveunit for a vehicle according to Embodiment 4 of the invention.

[0053] In the drawing, the hydraulic motor 10 is disposed as a powersource of the vehicle, and the rotation transmitting device 1 describedin the foregoing embodiment is connected to the drive shaft 11 of thehydraulic motor 10. The output shaft 51 of the rotation transmittingdevice 1 is connected to a transmission 101 through a clutch box 103.The rotating force of the output shaft 51 of the rotation transmittingdevice 1 is transmitted to a first generator 104 through a fan belt 126and a pulley 122, and is transmitted to a second generator 105 through afan belt 127 and a pulley 123.

[0054] A battery 108 or a battery 109 is charged with electric powergenerated in the first generator 104 through a charge relay switchingbox 106. On the other hand, a battery 110 or a battery 111 is chargedwith electric power generated in the second generator 105 through acharge relay switching box 107.

[0055] The electric power given to the mentioned battery 108 or 109 isused to drive an electric motor 112, and the electric power given to thementioned battery 110 or 111 is used to drive an electric motor 113. Theelectric motors 112 and 113 are controlled so that when one of themotors is driven, the other motor is caused to stop operation, and thebattery on the operation stopping motor side is charged with electricpower.

[0056] When the electric motor 112 is driven, this motor actuates ahydraulic suction pump 114, and hydraulic fluid is introduced from ahydraulic fluid tank 116 into a hydraulic switching valve 117. On theother hand, when the electric motor 113 is driven, this motor actuates ahydraulic suction pump 115, and hydraulic fluid is introduced from thehydraulic fluid tank 116 into the hydraulic switching valve 117. Aswitching feed spring 124 is used to switch automatically or manuallythe hydraulic switching valve 117. When the electric motor 112 isoperating, hydraulic fluid from the hydraulic suction pump 114 side isintroduced into a suction hose 130, and when the electric motor 113 isoperating, hydraulic fluid from the hydraulic suction pump 115 side isintroduced into the suction hose 130.

[0057] The hydraulic fluid in the suction hose 130 is introduced into ahydraulic actuation switching valve 118. In the hydraulic actuationswitching valve 118, the oil pressure is controlled in a multistagemanner by operating the operation switching feed spring 125, and isintroduced into the hydraulic motor 10 through a hydraulic hose 129.

Industrial Applicability

[0058] As described above, the rotation transmitting device according tothis invention can stably transmit rotation driving force produced by ahydraulic motor or the like to a device to be driven such as generator.The hydraulic drive unit utilizing this rotation transmitting device canbe used to act as a drive source of a vehicle.

What is claimed is:
 1. A rotation transmitting device characterized bycomprising: a rotating body that is connected to an input shaft drivenby a motor and functions by itself as a flywheel, and on the output sideof which an internal gear is formed; and a gear mechanism fortransmitting rotating force of said rotating body to an output shaftformed on an output shaft gear by allowing counter gears to mesh withsaid internal gear and the output shaft gear to mesh with said countergears.
 2. A rotation transmitting device characterized by comprising: arotating body that is connected to an input shaft driven by a motor andfunctions by itself as a flywheel, and on the output side of which aninternal gear is formed; and a gear mechanism for transmitting rotatingforce of said rotating body to an output shaft formed on an output shaftgear by allowing the output shaft gear to mesh with said internal gear.3. The rotation transmitting device according to claim 1 or 2characterized in that a mechanism for regulating axial movement of saidrotating body is disposed.
 4. The rotation transmitting device accordingto claim 1 or 2 characterized in that a brake mechanism that presses aband body provided with rollers or balls on the outer circumference ofsaid rotating body is disposed.
 5. A hydraulic drive unit in which ahydraulic motor is connected to a hydraulic pump driven by a drive shaftof a vehicle and a drive source is operated by rotating force of saidhydraulic motor, the hydraulic drive unit being characterized in that arotation transmitting device as defined in any of claims 1 to 4 isconnected to between said hydraulic motor and said drive source.
 6. Ahydraulic drive unit characterized by comprising: a hydraulic motor; arotation transmitting device including a rotating body that is connectedto a drive shaft of said hydraulic motor and functions by itself as aflywheel, and on the output side of which an internal gear is formed;and a gear mechanism for transmitting rotating force of said rotatingbody to an output shaft formed on an output shaft gear by allowingcounter gears to mesh with said internal gear and said output shaft gearto mesh with said counter gears; and an output shaft that is connectedto said output shaft gear.
 7. A hydraulic drive unit characterized bycomprising: a hydraulic motor; a rotation transmitting device includinga rotating body that is connected to a drive shaft of said hydraulicmotor and functions by itself as a flywheel, and on the output side ofwhich an internal gear is formed; and a gear mechanism for transmittingrotating force of said rotating body to an output shaft formed on anoutput shaft gear by allowing the output shaft gear to mesh with saidinternal gear; and an output shaft connected to said output shaft gear.8. The hydraulic drive unit according to claim 6 or 7 characterized inthat a mechanism for regulating axial movement of said rotating body isdisposed.
 9. The hydraulic drive unit according to claim 6 or 7characterized in that a brake mechanism that presses a band bodyprovided with rollers or balls on the outer circumference of saidrotating body is disposed.
 10. The hydraulic drive unit according to anyof claims 7 to 9 characterized by comprising a generator driven byrotation of said output shaft, a battery charged with power generated bysaid generator, an electric motor driven by the power of said battery,and a hydraulic suction pump that is driven by said electric motor andsucks hydraulic fluid from a hydraulic fluid tank; and in that thehydraulic fluid sucked by the hydraulic suction pump is introduced intosaid hydraulic motor through an actuation switching valve.
 11. Thehydraulic drive unit according to claim 10 characterized in that pluralsets of said generator and battery are disposed, and so long as abattery of any one set is working, a battery of the other set is chargedwith power.
 12. The hydraulic drive unit according to claim 10characterized in that plural sets of said electric motor and hydraulicsuction pump are disposed, and so long as any one set of electric motorand hydraulic suction pump are working, electric motor and hydraulicsuction pump of the other set are caused to stop operation.